【摘要】：針對(duì)機(jī)械式羅茨流量計(jì)存在的不足,本文研制一種基于MSP430單片機(jī)的數(shù)字顯示智能表頭的羅茨流量計(jì),它在滿足低功耗的基礎(chǔ)上實(shí)現(xiàn)了高精確測(cè)量。 本文將容積式流量計(jì)的計(jì)量原理與超低功耗單片機(jī)MSP430F149相結(jié)合,設(shè)計(jì)出工作可靠性強(qiáng)的硬件電路和運(yùn)行效率高的軟件代碼。在時(shí)鐘芯片和運(yùn)算放大器的選擇上,也都考慮到系統(tǒng)低功耗的要求,尤其是在流量信號(hào)檢測(cè)方面,本文選用了零功耗的韋根德傳感器,做到精確測(cè)量流量的同時(shí)又不消耗系統(tǒng)能量。針對(duì)氣體受工況溫度和壓力影響比較大的事實(shí),本文采用壓縮系數(shù)的方法進(jìn)行實(shí)時(shí)的溫壓補(bǔ)償,提高了流量計(jì)的測(cè)量精度。另外,根據(jù)脈沖頻率與儀表系數(shù)的關(guān)系,從軟件方面對(duì)流量?jī)x表的儀表系數(shù)進(jìn)行了分段修正,從而獲得準(zhǔn)確的儀表系數(shù),顯著地提高流量計(jì)測(cè)量精度。該羅茨流量計(jì)還有標(biāo)準(zhǔn)信號(hào)輸出模塊和RS485通信模塊,可以與上位機(jī)很方便地進(jìn)行通信。液晶模塊的設(shè)計(jì),實(shí)現(xiàn)了友好的用戶界面。操作簡(jiǎn)單的按鍵模塊,供用戶隨時(shí)修改參數(shù)和查看時(shí)間。 通過理論分析和現(xiàn)場(chǎng)實(shí)驗(yàn),證明這種流量計(jì)實(shí)現(xiàn)了在低功耗基礎(chǔ)上的精確測(cè)量,有很好的發(fā)展前景。
[Abstract]:Aiming at the shortage of mechanical Roots Flowmeter, a kind of Roots Flowmeter with digital display intelligent head based on MSP430 microcontroller is developed in this paper. It realizes high precision measurement on the basis of low power consumption. In this paper, the measuring principle of the volumetric Flowmeter is combined with the ultra-low power consumption single chip computer (MSP430F149) to design the hardware circuit with strong reliability and the software code with high running efficiency. In the selection of clock chips and operational amplifiers, the requirement of low power consumption is also taken into account. Especially in the aspect of traffic signal detection, the zero-power Wagend sensor is used in this paper. Accurate measurement of flow without consuming system energy. In view of the fact that the gas is greatly affected by temperature and pressure, the compression coefficient method is used to compensate the temperature and pressure in real time, which improves the measuring accuracy of the Flowmeter. In addition, according to the relation between the pulse frequency and the instrument coefficient, the instrument coefficient of the flow meter is modified by software in order to obtain the accurate instrument coefficient and improve the measuring accuracy of the Flowmeter. The Roots Flowmeter also has the standard signal output module and the RS485 communication module, which can communicate conveniently with the upper computer. The design of liquid crystal module realizes friendly user interface. Simple operation of the key module, for users to modify parameters and view time. Through theoretical analysis and field experiments, it is proved that the Flowmeter achieves accurate measurement on the basis of low power consumption and has a good prospect.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TP368.1;TP216.1

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